20133813391 has 4 divisors (see below), whose sum is σ = 21193487800. Its totient is φ = 19074138984.

The previous prime is 20133813389. The next prime is 20133813397. The reversal of 20133813391 is 19331833102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20133813391 - 2¹ = 20133813389 is a prime.

It is a super-2 number, since 2×20133813391² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133813397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529837176 + ... + 529837213.

It is an arithmetic number, because the mean of its divisors is an integer number (5298371950).

Almost surely, 2^20133813391 is an apocalyptic number.

20133813391 is a deficient number, since it is larger than the sum of its proper divisors (1059674409).

20133813391 is a wasteful number, since it uses less digits than its factorization.

20133813391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059674408.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 20133813391 in words is "twenty billion, one hundred thirty-three million, eight hundred thirteen thousand, three hundred ninety-one".